What's inside
As an Amazon Associate I earn from qualifying purchases. This post may contain affiliate links at no extra cost to you.
Contents
Fall Beginner Plans for a Wooden Outdoor Blanket Chest
A wooden outdoor blanket chest is a useful first furniture project because it is mostly straight cuts, simple joinery, and a forgiving finish. Build one in fall and you get a dry place for patio cushions, throws, garden games, or firewood kindling before winter arrives.
This plan makes a chest approximately 36 inches wide, 18 inches deep, and 20 inches tall, not including the lid. It is large enough for several folded blankets but small enough for one person to move. The design uses exterior plywood, dimensional lumber, screws, and a hinged lid. It is not a waterproof storage box unless you add careful sealing and a weather-resistant lid detail.
Materials and tools
Use 3/4-inch exterior plywood for the front, back, sides, bottom, and lid. One 4-by-8-foot sheet is usually enough if you plan the cuts carefully, though a second sheet may be needed if you want a wide, one-piece lid with generous overhang. For the frame and base, buy four straight 1-by-2 or 1-by-3 boards rated for exterior use.
For outdoor use, choose exterior wood screws, exterior wood glue, two or three outdoor-rated hinges, and a lid support or soft-close chest hinge. A beginner-friendly tool list includes a circular saw, drill and driver, tape measure, combination square, clamps, and sanding block. A jigsaw is useful for trimming corners but is not required.
| Material choice | Advantages | Drawbacks | Best use |
|---|---|---|---|
| Exterior plywood | Stable, affordable, easy to cut | Edges need sealing; surface can delaminate if neglected | Best all-around choice |
| Cedar boards | Light, naturally decay-resistant, attractive | Costs more and may cup or split | Exposed slat-style chests |
| Pressure-treated lumber | Resists rot and is inexpensive | Often wet, rough, and prone to movement | Hidden base parts only |
The cheaper exterior plywood option is fine if the chest sits under a covered porch and you seal every edge. Do not use interior plywood outdoors; its glue lines can fail after repeated wetting.
Cut list and design details
Cut the main panels to these dimensions:
- Front and back: two pieces, 36 by 18 inches
- Ends: two pieces, 16 1/2 by 18 inches
- Bottom: one piece, 34 1/2 by 16 1/2 inches
- Lid: one piece, 38 by 20 inches
- Base rails: two pieces, 36 inches long, and two pieces, 16 1/2 inches long
The end panels fit between the front and back panels, which explains their 16 1/2-inch width. The bottom fits inside the box. If your plywood measures slightly less than 3/4 inch, measure the actual thickness and adjust the bottom and base dimensions rather than forcing the parts together.
For a safer lid, use a lid support that prevents it from falling backward or slamming shut. A heavy, unsupported lid can pinch fingers, especially around children. If you plan to store blankets, avoid making the chest airtight. Trapped moisture can produce mildew even when rain never enters.
Build the box
Start by checking each plywood edge with a square. Mark the cut lines with a sharp pencil and support the sheet on scrap foam or sawhorses. A circular saw with a straightedge guide gives cleaner, more predictable cuts than trying to follow a pencil line freehand.
Dry-fit the front, back, and ends on a flat surface. The top edges should line up. Apply a thin bead of exterior wood glue to each joint, then clamp the panels or hold them firmly while driving 1 1/4-inch screws every 6 to 8 inches. Drill pilot holes near the plywood edges; without them, the face veneers can split.
Set the bottom inside the assembled box. Check the diagonals from corner to corner. If they differ by more than about 1/8 inch, push the longer diagonal inward until the box is square. Screw through the front, back, and ends into the bottom every 6 inches. Wipe away squeezed-out glue before it dries.
Add the base and lid
Assemble the four base rails into a rectangle slightly smaller than the box footprint. Attach this frame underneath the chest with screws driven from inside the box. The base lifts the plywood off damp concrete and gives the lower edges a better chance to dry. Add plastic or rubber feet if the chest will sit directly on a deck.
Test-fit the lid with an even overhang of about 1 inch on all four sides. Round the exposed corners with a jigsaw or sanding block. A sharp plywood corner is an easy snag point on a patio. Sand the lid and box to 120 grit, then finish with 150 grit where you will touch the surface often.
Install the hinges while the lid is centered. Predrill every hole, especially near plywood edges. Leave roughly 3 inches between each hinge and the lid ends if using three hinges. Mount the lid support before applying the finish, then open and close it several times to confirm that the support does not twist the back panel.
Seal the chest for fall weather
Outdoor durability depends more on edge sealing than on the brand of paint. Brush two coats of exterior primer onto every plywood edge, including the underside of the lid and bottom panel. Pay particular attention to screw holes and the lower corners. Let the first coat dry fully before sanding lightly and applying the second.
Finish with two coats of exterior porch paint for the strongest water resistance, or use an exterior penetrating stain if you want the plywood texture to remain visible. Paint is usually the better beginner choice because it hides patched screw holes and uneven color. Use exterior wood primer and paint rather than interior products.
After the finish cures, add a narrow strip of self-adhesive weatherstripping around the upper rim. This reduces driven rain but should not create a completely sealed cavity. Drill two or three small ventilation holes under the rear overhang, where rain is less likely to reach them. Cover the holes with stainless or plastic mesh to keep insects out.
Common beginner mistakes
Do not skip the dry fit. A panel cut 1/8 inch short may be manageable, but a panel cut long can push the box out of square. Do not drive screws too close to a plywood corner. Keep at least 3/8 inch from the edge and use pilot holes.
The most common outdoor failure is an unsealed bottom edge. Water wicks into plywood from below, then lifts the veneers. The second is a lid with no overhang, which directs rain onto the front panel. Finally, do not store wet blankets immediately after a storm. Open the lid on a dry day and inspect the interior each fall for dampness, loose hardware, or cracked finish.
For a sheltered porch, this simple plywood version is economical and adequate. For an exposed yard, spend more on cedar or add a small roof-like lid cap; better drainage and maintenance matter more than decorative trim.